I need to solder my RC helicopter circuit board but the board is SO tiny I do not feel comfortable with an electrical solder iron. Besides, soldering is not my strong point. A train forum thread said liquid solder has high resistance. Any suggestions? Thank you! Bob

I am no expert but I think liquid solder is not a solder it is a glue/epoxy type material. It has very little to no electricAL transfer. You need to solder it. Go to Radio Shack. They may know someone in your area to do it for you.

I got the same set in a box of other items at an auction and found it (while not Pro quality), to be more than adequate for doing just a few connections at a time. You get the iron, 2 tips, solder sucker and some electronic sized solder.

If you have a good soldering iron you can put a smaller tip into it. If you have a cheapie just grind the tip to a fine point and then tin it with a bit of solder first. Remember the iron is to heat the part and the copper on the circuit board. You need to heat each and tin them. Once you have all three tinned (board, part to be soldered, and iron) then heat them with the iron and join them. You must hold them still until the solder solidifies. Remember you have to get it hot enough to melt the solder on the iron, part and board (way past the "ouch" point), but not hot enough to fry the component or melt nearby parts.

It is way easier than it sounds. I suggest you practice by removing integrated circuits from your television or cell phone. Another good place to practice is on any crimp-on connectors you have put into your car's wiring!